# TranslogCorruptedException: translog corruption detected at position 67890 while recovering index [my_index] shard [0]

- **ID:** `elasticsearch/translog-corruption-during-recovery`
- **Domain:** elasticsearch
- **Category:** system_error
- **Verification:** ai_generated
- **Fix Rate:** 70%

## Root Cause

The transaction log file for a shard is corrupted, often due to abrupt node shutdown, disk errors, or filesystem issues, preventing shard recovery.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Elasticsearch 7.16.0 | active | — | — |
| Elasticsearch 8.8.0 | active | — | — |
| Elasticsearch 8.15.0 | active | — | — |

## Workarounds

1. **Use the Elasticsearch CLI tool `elasticsearch-shard` to truncate the translog. Run: `bin/elasticsearch-shard remove-corrupted-data --index my_index --shard 0`. This removes corrupted translog entries and allows the shard to recover with potential data loss of recent operations.** (80% success)
   ```
   Use the Elasticsearch CLI tool `elasticsearch-shard` to truncate the translog. Run: `bin/elasticsearch-shard remove-corrupted-data --index my_index --shard 0`. This removes corrupted translog entries and allows the shard to recover with potential data loss of recent operations.
   ```
2. **Restore the shard from a snapshot. If a snapshot exists, delete the corrupt index and restore: `POST /_snapshot/my_repo/my_snapshot/_restore {"indices": "my_index", "rename_pattern": "my_index", "rename_replacement": "my_index"}`. Ensure the snapshot is recent enough.** (72% success)
   ```
   Restore the shard from a snapshot. If a snapshot exists, delete the corrupt index and restore: `POST /_snapshot/my_repo/my_snapshot/_restore {"indices": "my_index", "rename_pattern": "my_index", "rename_replacement": "my_index"}`. Ensure the snapshot is recent enough.
   ```

## Dead Ends

- **** — This may cause data loss and prevent the shard from recovering at all because Elasticsearch expects a valid translog; the shard may become permanently unassigned. (85% fail)
- **** — If the corrupt shard is the primary, the cluster cannot allocate it, and reindexing from a snapshot may not include recent data not in the snapshot. (60% fail)